Become a nox mesh module: smtp granted, the shared channel accepted

The mailu smtp grant replaces the hand-carried mailbox credential — the
module contributes account amqp-forwarder and composes its login from
the binding, the de-spiegel pattern. The AMQP side stays the operator's
on purpose: EMAILDELIVERY_T is a vhost external publishers share, which
the consumer-owned-vhost provision deliberately cannot express, so the
URL rides as an accepted secret. Built from source; the old image's
registry no longer exists.

Dockerfile

@@ -1,4 +1,6 @@
-FROM node:22-alpine
+# The base arrives pinned from module.json's build.on.
+ARG NODE_BASE
+FROM ${NODE_BASE}
 WORKDIR /app
 COPY package.json ./
 RUN npm install --production

module.json

@@ -0,0 +1,65 @@
+{
+  "module": "amqp-email-forwarder",
+  "version": "1",
+  "slug": "forwarder",
+  "capabilities": [
+    "container-runtime"
+  ],
+  "requires": [
+    "smtp"
+  ],
+  "contributes": {
+    "smtp": {
+      "account": "amqp-forwarder"
+    }
+  },
+  "binds": {
+    "smtp": "${dir:state}/smtp.json"
+  },
+  "secrets": {
+    "smtp": "${dir:state}/smtp.secret"
+  },
+  "own-secrets": {
+    "amqp-url": "${dir:state}/amqp-url.secret"
+  },
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "place": ".",
+      "mode": "0700"
+    },
+    {
+      "id": "env",
+      "type": "file",
+      "path": "${dir:state}/forwarder.env",
+      "mode": "0600",
+      "content": "AMQP_URL=${secret:amqp-url}\nAMQP_EXCHANGE=News.TransactionalEmailing.Command\nAMQP_QUEUE=email-forwarder\nSMTP_HOST=${bound:smtp:at}\nSMTP_PORT=${bound:smtp:port}\nSMTP_USER=amqp-forwarder@${bound:smtp:domain}\nSMTP_PASSWORD=${secret:smtp}\nNOTIFY_FROM=amqp-forwarder@${bound:smtp:domain}\nNOTIFY_TO=jochen.schoubben@mediahuis.be\n"
+    },
+    {
+      "id": "server",
+      "type": "container",
+      "name": "amqp-email-forwarder",
+      "artifact": "server",
+      "env-file": [
+        "${dir:state}/forwarder.env"
+      ],
+      "secrets-in-environment": "the application reads AMQP_URL and SMTP_PASSWORD from the environment (app.js); converting is this repository's change. The AMQP credential is the operator's: the EMAILDELIVERY_T vhost is a channel external publishers share, which the consumer-owned-vhost amqp provision deliberately cannot express, so the mesh carries the credential as an accepted secret rather than minting one nobody else would know"
+    }
+  ],
+  "build": {
+    "on": [
+      {
+        "arg": "NODE_BASE",
+        "image": "node@sha256:0a7108bf6c7bf5de370ffb1a3ed6be93d405b43ff159f681a8d18c0e2bc2e402"
+      }
+    ],
+    "artifacts": [
+      {
+        "name": "server",
+        "kind": "image",
+        "from": "Dockerfile"
+      }
+    ]
+  }
+}